- Cable TV Companies & Services, Northumberland
- Cafe Restaurants, Northumberland
- Campgrounds, Northumberland
- Canners & Food Processors, Northumberland
- Car Detailing & Wash Service, Northumberland - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Northumberland
- Carpet Rug & Upholstery Cleaners, Northumberland
- Carpet, Rug & Linoleum Flooring Dealers, Northumberland
- Cars, Truck, Van & SUV Car Dealerships, Northumberland - Auto Dealers
- Casual Dining Restaurants, Northumberland
- Caterers Food Services, Northumberland
- Central American Restaurants, Northumberland
- Ceramic Tile Flooring, Northumberland
- Ceramic Tile Installation - Repair, Northumberland - Ceramic Tiles Contractors
- Child Abuse Information & Treatment Centers, Northumberland
- Child Care & Day Care Services, Northumberland
- Child Related Social Services, Northumberland
- Chinese Restaurants, Northumberland
- Chiropractor, Northumberland
- Church Of Jesus Christ Of Latter Day Saints, Northumberland
- Churches 1 Of 3, Northumberland
- Churches 2 Of 3, Northumberland
- Cigar, Cigarette & Tobacco Store & Supplies, Northumberland
- City & County Administrative Agencies, Northumberland
- City & County Government, Northumberland
- City & County Law Enforcement, Northumberland
- Cleaning & Maintenance Services, Northumberland
- Clergy, Northumberland
- Clothing Stores, Northumberland - Clothes & Accessories
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- CNC Machine Shop, Northumberland
- Collectibles, Northumberland
- Commercial Equipment, Northumberland
- Commercial Printing, Northumberland
- Commercial Printing Manufacturers, Northumberland
- Communications Services, Northumberland
- Community & Recreational Facilities, Northumberland
- Community Services, Northumberland
- Concrete, Northumberland - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Northumberland
- Concrete Contractors, Northumberland - Concrete Construction & Concrete Companies
- Concrete Handling Services, Northumberland - Concrete Pumping
- Concrete Product Manufacturers, Northumberland
- Condiments & Sauces, Northumberland
- Construction, Northumberland
- Construction Companies, Northumberland
- Consultants & Services, Northumberland
- Contractor Equipment & Supplies, Northumberland - Construction Equipment & Machinery
- Contractors Equipment & Supplies - Rental & Leasing, Northumberland
- Convenience Stores, Northumberland
- Cooking, Food & Beverage Equipment, Northumberland
- Copying & Duplicating Services, Northumberland
- County Police, Northumberland
- Crane Services, Northumberland
- Cranes & Derricks, Northumberland
- Cranes Hoisting & Rigging Service, Northumberland - Crane Rental Service
- Criminal Attorneys & Lawyers, Northumberland
- Criminal Defense Attorneys & Lawyers, Northumberland
- Criminal Defense Lawyers & Attorneys, Northumberland
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